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ventilation shaft, ventilator, ventilation shaft, ventilator, architecture, built structure, wall - building feature, window, no people

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gray, ventilation shaft, roof, commercial air conditioning, commercial hvac, commercial exhaust, hvac installation, exhaust installation

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brown, concrete, deep, water, well, mine shaft, vent, shaft

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stack of tug boat, boat, tug, old, retired, stack, air scoop, ventilation shaft

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stack of tug boat, boat, tug, old, retired, stack, air scoop, ventilation shaft

Public Domain